Grinding-mill.



Patented Deo. 27, 1.910.

2 SHEETS-@EEETL J. BRGHA.

GRINDING MILL.V APPLICATION FILED MABJI, 1910. 980,048.

1HE 'vonnis PETERS ca., WASHINGTON. n, c.

J. BRECHA. GRINDING MILL.

APPLICATION FILED MAB. l1, 1910.

Patented 1060.27, 1910.

2 SHEETS-SHEET 2.

m W M www THE NoRRIs PETERS ca., WASHINGTON, L*4 c.

'NETE STARS par arriba.

JOSEPH BERCHA, OF BEATRICE, NEBRASKA.

GRNDING-MILL.

sedo/as.

To all 'whom it may concern:

Be it known that I, JOSEPH BERCHA, a citizen of the United States of America, residing at Beatrice, in the county of Gage and State of Nebraska, have invented new and useful Improvements in Grinding-Mills, of which the following is a specification.

This invention relates to grinding mills, and the particular object of the invention is to produce a mill, whereby notonly grains, but fibrous material, such as hay and the like, may be comminuted to the desired degree of fineness.

With this and other ends in view, which will readily appear as the nature of the invention is better understood, the same consists in t-he improved construction and novel arrangement and combination of parts which will be hereinafter fully described and particularly pointed out in the claims.

In the drawings, Figure 1 is a sectional front elevation of a grinding mill constructed in accordance with the invention. Fig. 2 is a horizontal sectional view taken through the grinding mechanism. Fig. 3 is a sectional side elevation.

Corresponding parts in the several figures are denoted by like characters of reference.

The main shaft 1 of the improved mill is supported for rotation in bearings 2 upon a frame which includes a casing 3 into which the main shaft extends, said casing including a detachable end piece 3. The shaft 1 carries within the casing 3 a male grinding bur 4, tapering toward the ends so as to present a double conical shape, said bur being securely7 and adjustably mounted upon the shaft by means of a key 5 and a nut (3, the latter being threaded upon the end of a shaft and tightened against the bur. The exteriorl surface of the bur 4 is suitably dressed to cooperate with the dress upon the inner surface of the female bur B, the latter being composed of two tapering or cone- 45 shaped members 7 and 7 provided at their eting edges with interengaging flanges S .pjermitting the sections or members 7 and 7 be adjusted relatively toward or away fronA each other to entirely separate the 50 same. The sections 7 and 7 are provided with laterally extending lugs designated, respectively, 9 and 9, said lugs being apertured for the passage of supporting rods 10 Specification of Letters Patent.

Application led March 11, 1910.

Patented Dec. 27, 1910.

Serial No. 548,560.

disposed horizontally within the casing 3 and mounted securely in the walls of said casing, thereby adjustably supporting the sections or members of the female grinding bur.

Securely mounted in thelugs9 of the member 7 adjacent to the meeting edges of the sections are rods or bolts 11 which are guided slidably through the lugs 9 of the member 7 and through tubes or sleeves 12 connected with the outermost lugs of the member 7 and extending through the detachable wall member 3 of the casing, the outer ends of the sleeves 12 being secured upon a cross bar 13 through which the bolts or rods 11 extend, said bolts being secured in a cross bar 14E wherein is threaded an adjusting screw 15 having a hand wheel 16, whereby it may be manipulated to tighten it against the cross bar 13.

It will be observed that lby tightening the screw 15, the cross bar 18 with the tubes 1Q and the member 7 of the female grinding bur will be forced inward in the direction of the member 7, while the latter7 being connected by the bolts 11 with the cross bar 13, will be forced outward in the direction of the member' 7 thus decreasing the distance between the dressed faces of the female bur sections and the correspondingly dressed face portions of the male bur, and thereby regulating the ineness of the material ground between the burs. 0n the other hand, by loosening the screw, the members of t-he female bur will quickly be forced apart by the pressure of the material ground in the mill, thereby increasing the distance between the dressed faces of the male and the female bur sections and causing the material to be ground more coarsely. It will be understood that in adjusting the distance between the male and female bur faces, the relative even distance between said faces will be maintained by the material passing between said faces in the act of being ground or operated upon, said material passing so evenly between the respective faces that an even distance will be maintained therebetween in practice, causing the material to be evenly ground or comminuted to the desired fineness. If the even distance between the respective faces should be disturbed while the mill is not in operation, it will be quickly gaging the guide rods, sleeves connected with one bur member and extending through the easing, bolts Connected With the other bur member and guided through the sleeves of the irst bur member, a cross bar connecting the sleeves, said cross bar being apertured for the passage of the bolts, a cross bar connecting the bolts, and an adjusting screw threaded in the latter cross bar and bearing against the first cross bar.

In testimony whereof I aIiX my signature n presence of two Witnesses.

JOSEPH BERCHA. Witnesses C. E. CONN, J. T. HARDEN. 

